Low-temperature sinterable microwave dielectric ceramic Ca3Y4V2O14 having low dielectric constant

Abstract

The invention discloses low-temperature sinterable temperature-stable type microwave dielectric ceramic Ca3Y4V2O14 having a low dielectric constant and a preparing method thereof. The method includes: (1) weighing original powder having purity higher than 99.9% (that is a weight percentage) of CaCO3, Y2O3 and V2O5 according to constitution of the Ca3Y4V2O14 and blending; (2) subjecting the raw materials in the step (1) to wet ball milling and mixing for 12 h, with a ball milling medium being distilled water, drying, and pre-sintering at 820 DEG C in an atmosphere of air for 6 h; and (3) adding an adhesive into the powder prepared in the step (2), granulating, performing compression moulding, and sintering at 870-920 DEG C in the atmosphere of air for 4 h, wherein the adhesive adopts a polyvinyl alcohol solution having a mass concentration of 5%, and the adding amount of the polyvinyl alcohol is 3% of the total mass of the powder. The ceramic prepared by the method is good in sintering performance at 870-920 DEG C, the dielectric constant of the ceramic is 25.4-26.3, the quality factor Qf of the ceramic is 49000-63000 GHz, and the temperature coefficient of resonance frequency of the ceramic is small. The ceramic has high application value in the industry.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a dielectric ceramic material used to manufacture microwave components such as dielectric substrates, ceramic resonators and filters, and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in circuits in the microwave frequency band (mainly UHF and SHF bands) and perform one or more functions. They are widely used as resonators, filters, and dielectric substrates in modern communications. Components such as chips and dielectric waveguide circuits are the key basic materials of modern communication technology. They have been used in portable mobile phones, car phones, cordless phones, TV satellite receivers and military radars. They are used in modern communication tools. It is playing an increasingly important role in the process of miniaturization and integration. [0003] Dielectric c...

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Problems solved by technology

[0010] In the process of exploring and developing new low-firing microwave dielectric ceramic materials, material systems such as Li-based compounds, Bi-based compounds, tungstate compounds and tellurate-based compounds with inherently low sintering temperatures have received extensive attention and research. However, due to the three performance indicators of microwave dielectric ceramics (ε r with Q f and τ ? ) is a mutually restrictive relationship (see literature: The restrictive relationship between the dielectric properties of microwave dielectric ceramic materials, Zhu Jianhua, Liang Fei, Wang Xiaohong, Lu Wenzhong, Electronic Components and Materials, Issue 3, March 2005), satisfying three There are very few single-phase microwave dielectric ceramics that require individual performance and can be sintered at low temperature, and their resonant frequency temperature coefficient is usually too large or the quality factor is too low to be practically produced and applied.

At present, most of the research on microwave dielectric ceramics is a summary of experience obtained through a large number of experiments, but there is no complete theory to explain the relationship between microstructure and dielectric properties. Predict whether it has microwave dielectric properties and the numerical range of performance parameters such as resonant frequency temperature coefficient and quality factor, which largely limits the development of low temperature co-firing technology and microwave multilayer devices

Explore and develop low-temperature sintering and near-zero resonant frequency temperature coefficient (-10 ppm / ℃≤τ ? ≤+10 ppm / ℃) and high quality factor microwave dielectric ceramics are difficult problems that those skilled in the art have been eager to solve but have always been difficult to achieve

Our pair group becomes Ba 3 Y 4 V 2 o 14 、Sr 3 Y 4 V 2 o 14 , Ca 3 Y 4 V 2 o 14 , Pb 3 Y 4 V 2 o 14 The microwave dielectric properties of vanadates were studied, in which it was found that Ca 3 Y 4 V 2 o 14 It has near-zero resonant frequency temperature coefficient and high quality factor, but the resonant frequency temperature coefficient of other ceramics is too large (>20 ppm / ℃)

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